Days with My Stepsister, Vol. 6 (light novel)

HAPPY BIRTHDAY, YUUTA AND SAKI. Infected by the magic of Halloween night, Yuuta and Saki sought out each other's warmth. Though their relationship might look the same to those around them, everything is different when they're alone. As the two spend winter together for the first time, including birthday, Christmas, and New Year's celebrations, they struggle to balance communication and the joy of surprise. How can they make each other happy, and where are they headed. Are marriage and children in their future, or something else entirely.